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5.47% of people in a small sample, out of 311, have tested positive in a cross-sectional study of population prevalence of seropositivity to SARS-CoV-2 carried out between April 21 and 27 in the Sardinian Primary Care Team, from Barcelona. The sample included randomized patients of all age ranges , which is why it is considered that it represents the reference population of the Horta-Guinardó district of Barcelona.
The positives in the group of men are 4.4% and in the group of women, 6.4%. The distribution by age groups adjusts to the age distribution of the district's population and, from the results obtained, it appears that the prevalence is higher in the groups of adolescents and young people and in people over 80 years of age .
Capillary blood samples have been used for the study and the tests used are of rapid diagnosis, which allow detection of IgG and IgM by the diffusion immunochromatography technique.
The EAP Sardinia is a primary center managed by a group of doctors and nurses and arranged with the Catalan Health service that collaborates with the Hospital de Sant Pau. It is directed by the vice president of the Barcelona College of Physicians, Jaume Sellarés. And the main investigator of this study, possibly the first of its characteristics in the national primary, is Carlos Brotons, director of the Research Unit of the EAP Sardinia, created in 2002 and which since 2009 has been part of the Institute for Biomedical Research at the Hospital de Sant Pau.
The research team has worked in alliance with the Catalan Society of Family and Community Medicine (CAMFiC), the August Pi i Sunyer Institute for Biomedical Research (IDIBAPS) of the Hospital Clínic de Barcelona and the IDIAP Primary Care Research Institute Jordi Gol, from the Catalan Institute of Health. A group of Medicine students from the International University of Catalonia have collaborated.
The study is part of a larger study that has four population groups : a random sample of the reference population to determine the seroprevalence of Covid-19 infection; follow-up of all patients who have presented compatible symptoms and that follow-up has been done from primary care; study of the evolution of Covid-19 infection in residences in the area, and serological follow-up of healthcare workers from the professional team.
"In order to preserve the safety of the participants and users of the primary care center, the study was carried out in the casal (neighborhood center) of the neighborhood, a space given by the City Council and surrounded by gardens and wide open areas", you need the EAP Sardinia in your study.
In addition, the team has collected clinical and epidemiological data from patients through an application developed jointly with Universal Doctor (www.studies4covid19.org) and makes it available to other researchers to facilitate the collection of relevant information.
The results of this study, " are consistent with the results found in other recent international studies published in the framework of the Covid-19 pandemic: study in Geneva of 760 participants on April 6-17, with a seroprevalence of 5 % (SARS-CoV 2 IgG); in Wuhan, with 1,021 asymptomatic workers and 9.6% positive IgG / IgM - NAT negative; in Heinsberg, Germany, with 500 people and 14% with antibodies; in California, with 3,300 people and 4% -4.2% infected, and in Los Angeles, with 846 people and 4% considered immunized, "the authors assure.
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